CORE Water Sources and Rajasthan's Irrigation Spine
Rajasthan's irrigation map is shaped by scarcity, not by the presence of one large perennial river inside the state. The arid west receives transferred Ravi-Beas water through Indira Gandhi Nahar Pariyojana, Hadauti receives regulated Chambal water through the Kota barrage system, the south depends on Mahi and Jakham storages, and the eastern belt now looks toward the modified PKC-ERCP link. This geography explains why project names often carry a river outside the immediate district: IGNP begins at Harike Barrage in Punjab, the Narmada Canal enters near Silu village in Sanchore, and Yamuna water is discussed at Hathnikund/Tajewala for Shekhawati. The source-wise irrigation pattern keeps the state grounded. In the official 2020-21 net irrigated area table, wells and tube-wells account for 6409749 hectares, canals account for 2145125 hectares, ponds only 47051 hectares, and other sources 176196 hectares. That distribution means groundwater is still the daily base of farming, while canals and reservoirs change the risk profile of selected regions. Drinking-water geography also overlaps with irrigation. Bisalpur supports Ajmer and parts of the Jaipur region, Jawai is important for Pali-Jodhpur supply, and Rajiv Gandhi Lift Canal carries IGNP-linked water toward Jodhpur. The same infrastructure can therefore be read through command area, town supply, aquifer pressure and district equity. Surface-water projects in Rajasthan usually need several layers before water reaches the field: headworks or reservoir, main canal, branch canal, distributary, watercourse and finally field application. Where the land lies above canal level, pumping stations and pressure systems become part of the geography rather than an engineering detail. Where the land is flat and drainage is weak, irrigation can create waterlogging and salinity unless canal lining, field drainage and groundwater use are managed together. In Rajasthan, a project is best understood through five facts: source river, headworks, command districts, year of commissioning or agreement, and the number that fixes its scale.